#	Title	Length	Track artist	Release title	Release artist	Release group type	Country/Date	Label	Catalog#
Official
1.1	いつか	4:51	シド	いつか	シド	Single	JP2011-09-28	Ki/oon (Japanese imprint)	KSCL-1860
1.8	いつか	4:51	シド	M&W	シド	Album	JP2012-08-01	Ki/oon (Japanese imprint)	KSCL-2095
2.3	いつか	4:50	シド	SID ALL SINGLES BEST	シド	Album + Compilation	JP2016-01-13	Ki/oon (Japanese imprint)	KSCL-2675, KSCL-2676
Pseudo-Release
1.8	Itsuka	4:51	シド	M&W	シド	Album
2.3	Itsuka	4:50	シド	SID ALL SINGLES BEST	シド	Album + Compilation

いつか

Appears on releases